Had it happen again in a fully lit environment, so wasn't that I guess. New theory...
If you level a character but they are not the currently selected character (you click the lvl up arrow for say Gale, while Shadowheart is selected) then the portrait may black out. If you double click the status portrait before levelling to ensure the selected character is the one you are about to level then didn't have the issue.
Not sure if that helps anyone else. Best of luck!
Last edited by Black_Elk; 05/09/23 10:49 PM.